质谱法
选择性反应监测
农药残留
检出限
串联质谱法
萃取(化学)
分析物
作者
Kevin Tran,David Eide,Susan M. Nickols,Michele R. Cromer,Armando U. O. Sabaa-Srur,Robert E. Smith
出处
期刊:Food Chemistry
[Elsevier]
日期:2012-10-15
卷期号:134 (4): 2398-2405
被引量:38
标识
DOI:10.1016/j.foodchem.2012.04.034
摘要
Products labelled as containing extracts from two mushrooms (cordyceps plus reishi) and the juices from acai, goji, mangosteen, noni, pomegranate, and sea buckthorn have been analysed for 174 different pesticides, using the validated QuEChERS method for sample preparation and electrospray LC-MS/MS in the positive ion mode for analysis. Pesticides were found in 10 of the 21 samples analysed. Most pesticides found were below the tolerance levels (1-6 μg/g, depending on the pesticide), but some were not. This included boscalid, dimethomorph, iprovalicarb, pyridaben, pyrimethanil, and imazalil, for which there is no tolerance reported or zero tolerance in any fruit. However, genuine acai that was harvested in the state of Para and lyophilised in Rio de Janeiro had no detectable pesticides, when analysed by both LC-MS/MS and GC-MS/MS, which can detect 213 more pesticides and industrial chemicals. Likewise no pesticides were found in one sample each of cordyceps plus reishi, sea buckthorn and noni.
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